package com.tyl.abstract1;

public class AbstractDemo1 {
    private String username;
    private static int a;
    private static final double PI=3.1415926;
    public AbstractDemo1() {
    }
    public AbstractDemo1(String username) {
        this.username = username;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public static int getA() {
        return a;
    }

    public static void setA(int a) {
        AbstractDemo1.a = a;
    }
}
